I would buy a trailer. Sooner or later you will get hurt if you are using a ramp to load the mower on the back of pickup. Sometimes my Exmark 36" walkbehind gets away from me when putting it on the trailer if I'm not careful.

The angle of the ramps are going to be so steep that you will likely have to wheelie the WB at the top to keep deck from dragging. I would get a trailer. No way in hell would I put my 667 pound WB (Without TruTrac) in a truck using ramps. Taking it out of the truck will probably be a tougher thing the loading it, I can just see the deck catching on ramps and the entire mower crashing to the ground.

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There was a guy on here that had pics of a bi-fold expanded metal gate that replaced the tailgate on his ranger. He put trimmer racks on the truck too.Look around you might find the thread , it was a neat setup. Also I agree, trying to run around loading and unloading with movable ramps, sooner or later there will be an accident. Trailer makes it so much easier.

How about length wise? And the point where the end of the ramps meets the tailgate, do you have any problems with the mower getting wedged from underneath?

For a Ranger, the ramps should be about 8 feet long. They'll stick out above the tailgate but it's a lot safer than making them too short. When ramps are the right length, they are fairly safe and easy to use.